Common Mistakes : Firstly

adverb

BAD: I went and sat next to him. Firstly, I didn’t speak. I just sat there wondering what I could say. Then I said, Nice day, isn’t it
GOOD: I went and sat next to him. At first, I didn’t speak. I just sat there wondering what I could say. Then I said, Nice day, isn’t it

.BAD: Firstly, I couldn’t understand the local people at all
.GOOD: At first, I couldn’t understand the local people at all